Carbon dioxide emissions from diesel and compressed natural gas buses during acceleration |
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| Authors: | ER Jayaratne ZD Ristovski L Morawska NK Meyer |
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| Institution: | 1. Jiangsu Key Laboratory of Urban ITS, Southeast University, Nanjing 211189, China;2. Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, Southeast University, Nanjing 211189, China;3. School of Transportation, Southeast University, Nanjing 211189, China;4. Department of Transportation Studies, Texas Southern University, Houston, TX 77004, USA;5. Lyles School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA;1. China Automotive Technology and Research Center Co., Ltd., Dongli District, Tianjin 300300, China;2. State School of Mechanical Engineering, Hebei University of Technology, Hongqiao District, Tianjin, 300130, China |
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| Abstract: | Motor vehicle emission factors are generally derived from driving tests mimicking steady state conditions or transient drive cycles. Neither of these test conditions, however, completely represents real world driving conditions. In particular, they fail to determine emissions generated during the accelerating phase – a condition in which urban buses spend much of their time. We analyse and compare the results of time-dependant emission measurements conducted on diesel and compressed natural gas buses during an urban driving cycle on a chassis dynamometer and we derive power-law expressions relating carbon dioxide emission factors to the instantaneous speed while accelerating from rest. Emissions during acceleration are compared with that during steady speed operation. |
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